remove unused #include

include/mruby.h

@@ -269,7 +269,9 @@ typedef struct mrb_state {
   mrb_sym symidx;
   struct kh_n2s *name2sym;      /* symbol table */
   struct kh_s2n *sym2name;      /* reverse symbol table */
+#ifdef INCLUDE_REGEXP
   struct RNode *local_svar;/* regexp */
+#endif
 
   struct RClass *eException_class;
   struct RClass *eStandardError_class;

src/symbol.c

@@ -16,12 +16,6 @@
 #include "mruby/variable.h"
 #include <stdio.h>
 
-#ifdef INCLUDE_REGEXP
-#include "re.h"
-#include "regex.h"
-#include "st.h"
-#endif
-
 /* ------------------------------------------------------ */
 KHASH_MAP_INIT_INT(s2n, const char*);
 KHASH_MAP_INIT_STR(n2s, mrb_sym);